when is big to big

I am interested in a larger display. My question is how big can you go for a primary display before it starts looking like crap. 27 inch ? 32 inch ? I want something pretty big, but not so big you cant read the text or is to big to be in your face.

thanks. Thats good news that 30 is feasible. I just measured it out with a tape measure and thats pretty huge. It might be easier for me to set up duel 24 inch displays in the long run. Thanks again at least I have some idea anyway.

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